From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The position of wheel experiments, comparing different tyres and rims.
| Identifier | ExFiles\Box 88\5\ scan0051 | |
| Date | 18th November 1936 | |
| FILE POSITION OF WHEEL EXPERIMENTS. (1) Bentley 6 X 17 tyres on 4" rims. The 6 X 17 India tyres have on the skid pan less cornering power than the Standard 5.50 X 18 and have to be run about 5 lbs/sq.in. harder for the same handling. The 6 X 17 Dunlop tyre has greater cornering power than the Standard tyre. Dunlops are going to confirm this on their rig. Sr. thinks his car more difficult to keep straight on 6 X 18 Indias. We have found same on 5.B.lV. GWH.{George W. Hancock - Head Chateauroux} reported on 6.B.lV. that [xx] the pressures have to be more accurately maintained. Dunlops will submit suggestions for a 5 X 17 rim in steel and dural together with tool costs. Dunlops will also supply figures for the weight reduction of the Salmson wheel over our present design. -------- (2) P.3. 5" rims. We have not instructed any light gauge wheels until we have had more experience of the original ones submitted which will run endurance on 33-EX. -------- Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||